I recently switched from my NVIDIA graphics card to the integrated Intel GPU (HD 3000) and I followed the guide at http://en.gentoo-wiki.com/wiki/Intel_GMA for configuration. Everything is working fine except for one occasional hiccup:

After I believe 10 min of inactivity, the displays are set to sleep mode. Upon moving the mouse or pressing a button on the keyboard, the displays turn on. Occasionally, however, the left monitor (HDMI1) receives a bad signal and causes the display to either appear scrambled or the on-screen display will indicate a bad signal and put the monitor to sleep.

My system boots into the console. I use startx to launch an xsession.

I've tried searching the web using keywords such as { intel, linux, monitor wake, bad signal to monitor, etc } with no luck of a similar issue.

Does anyone have any idea regarding this problem? Even after switching to the latest driver and kernel 3.6.8, I'm still getting it. I even tried a new video cable to see if that could be the problem. No luck.